I find you very verbose and intellectually active for someone who's under a spell of sloth!
It's likely a combination of things, I'll grant you, and you just might be lazy every now and then. We all are, I'm sure. But the fact is: there are some activities where you don't suffer from your predicament as much. I'm willing to bet that those activities are generally without any important consequences for your life. Like Webdip, or arguing on the web, etc. So from that point of view, I'd like to think that your issue is not so much sloth, but your incapacity to plot a clear course for your future, the feeling that any performance properly lead to its term will somehow bind you and leave you incapable of choosing your own possibilities. And that, the stress of losing possibilities, becomes a burden that slows you down, makes you incapable of starting projects you once valued, or keeping up with them as you see the ramifications and implications...
Dude... If that's the case, then you suffer from a "high fidelity" complex! Go rent the movie, read the book, and get a good look at the illness. It also comes with possible solutions to your predicament.